Question : If $a-b=2$ and $ab=24$, then what is the value of $a^3-b^3$?

Option 1: 280

Option 2: 124

Option 3: 140

Option 4: 152

Question : If $a + b + c = 0$ and $ab + bc + ca = -11$, then what is the value of $a^2+b^2+c^2$?

Option 1: –11

Option 2: 22

Option 3: 0

Option 4: 11

Question : If cos A = $\frac{5}{13}$, then what is the value of (tan A + cot A)?

Option 1: $\frac{60}{169}$

Option 2: $\frac{109}{169}$

Option 3: $\frac{169}{60}$

Option 4: $\frac{169}{109}$

Question : If a + b + c = 1, ab + bc + ca = –1, and abc = –1, then what is the value of a³ + b³ + c³?

Option 1: 1

Option 2: 5

Option 3: 3

Option 4: 2

Question : The value of [(24 –12) ÷ 4] + [81 – 48 ÷ 12 of 2] is:

Option 1: 67

Option 2: 73

Option 3: 35

Option 4: 82